fix: stabilize auth-to-tenant flow and correct tenant header mapping

Resolve post-login routing and tenant context issues by proxying frontend API
calls, redirecting authenticated users away from /login, and hardening club
loading with retries/loading guards.

Align tenant identity end-to-end by returning tenantId in /api/clubs/me and
sending X-Tenant-Id from cookie-backed tenantId instead of local clubId,
restoring authorized tasks/shifts data access after club selection.

backend/WorkClub.Api/Services/ClubService.cs

@@ -112,7 +112,8 @@ public class ClubService
                         clubId.Value,
                         clubName,
                         sportTypeEnum,
-                        memberCount
+                        memberCount,
+                        Guid.Parse(tenantId)
                     ));
                 }
             }

backend/WorkClub.Application/Clubs/DTOs/ClubListDto.cs

@@ -4,4 +4,5 @@ public record ClubListDto(
     Guid Id,
     string Name,
     string SportType,
-    int MemberCount);
+    int MemberCount,
+    Guid TenantId);

frontend/next.config.ts

@@ -2,6 +2,15 @@ import type { NextConfig } from "next";
 
 const nextConfig: NextConfig = {
   output: 'standalone',
+  async rewrites() {
+    const apiUrl = process.env.NEXT_PUBLIC_API_URL || 'http://localhost:5001';
+    return [
+      {
+        source: '/api/:path((?!auth).*)',
+        destination: `${apiUrl}/api/:path*`,
+      },
+    ];
+  },
 };
 
 export default nextConfig;

frontend/src/app/login/page.tsx

@@ -1,12 +1,24 @@
 'use client';
 
-import { signIn } from 'next-auth/react';
+import { useEffect } from 'react';
+import { signIn, useSession } from 'next-auth/react';
+import { useRouter } from 'next/navigation';
 import { Card, CardHeader, CardTitle, CardContent } from '@/components/ui/card';
 import { Button } from '@/components/ui/button';
 
 export default function LoginPage() {
+  const { status } = useSession();
+  const router = useRouter();
+
+  // Redirect to dashboard if already authenticated
+  useEffect(() => {
+    if (status === 'authenticated') {
+      router.push('/dashboard');
+    }
+  }, [status, router]);
+
   const handleSignIn = () => {
-    signIn('keycloak');
+    signIn('keycloak', { callbackUrl: '/dashboard' });
   };
 
   return (

frontend/src/components/auth-guard.tsx

@@ -7,7 +7,7 @@ import { useTenant } from '../contexts/tenant-context';
 
 export function AuthGuard({ children }: { children: ReactNode }) {
   const { data: session, status } = useSession();
-  const { activeClubId, clubs, setActiveClub } = useTenant();
+  const { activeClubId, clubs, setActiveClub, clubsLoading } = useTenant();
   const router = useRouter();
 
   useEffect(() => {
@@ -38,6 +38,14 @@ export function AuthGuard({ children }: { children: ReactNode }) {
     return null;
   }
 
+  if (status === 'authenticated' && clubsLoading) {
+    return (
+      <div className="flex items-center justify-center min-h-screen">
+        <p>Loading...</p>
+      </div>
+    );
+  }
+
   if (clubs.length === 0 && status === 'authenticated') {
     return (
       <div className="flex flex-col items-center justify-center min-h-screen gap-4">

frontend/src/contexts/tenant-context.tsx

@@ -8,6 +8,7 @@ type Club = {
   id: string;
   name: string;
   sportType: string;
+  tenantId: string;
 };
 
 type TenantContextType = {
@@ -15,6 +16,8 @@ type TenantContextType = {
   setActiveClub: (clubId: string) => void;
   userRole: string | null;
   clubs: Club[];
+  clubsLoading: boolean;
+  clubsError: Error | null;
 };
 
 const TenantContext = createContext<TenantContextType | undefined>(undefined);
@@ -24,14 +27,20 @@ export function TenantProvider({ children }: { children: ReactNode }) {
   const [activeClubId, setActiveClubId] = useState<string | null>(null);
   const queryClient = useQueryClient();
 
-  const { data: clubs = [] } = useQuery<Club[]>({
-    queryKey: ['my-clubs'],
+  const { data: clubs = [], isLoading: clubsLoading, error: clubsError } = useQuery<Club[]>({
+    queryKey: ['my-clubs', session?.accessToken],
     queryFn: async () => {
-      const res = await fetch('/api/clubs/me');
-      if (!res.ok) return [];
+      const res = await fetch('/api/clubs/me', {
+        headers: {
+          Authorization: `Bearer ${session?.accessToken}`,
+        },
+      });
+      if (!res.ok) throw new Error(`Failed to fetch clubs: ${res.statusText}`);
       return res.json();
     },
-    enabled: status === 'authenticated',
+    enabled: status === 'authenticated' && !!session?.accessToken,
+    retry: 3,
+    retryDelay: (attemptIndex) => Math.min(1000 * Math.pow(2, attemptIndex), 10000),
   });
 
   useEffect(() => {
@@ -47,21 +56,27 @@ export function TenantProvider({ children }: { children: ReactNode }) {
 
   useEffect(() => {
     if (activeClubId) {
-      document.cookie = `X-Tenant-Id=${activeClubId}; path=/; max-age=86400`;
+      const selectedClub = clubs.find(c => c.id === activeClubId);
+      if (selectedClub) {
+        document.cookie = `X-Tenant-Id=${selectedClub.tenantId}; path=/; max-age=86400`;
       }
-  }, [activeClubId]);
+    }
+  }, [activeClubId, clubs]);
 
   const handleSetActiveClub = (clubId: string) => {
     setActiveClubId(clubId);
     localStorage.setItem('activeClubId', clubId);
-    document.cookie = `X-Tenant-Id=${clubId}; path=/; max-age=86400`;
+    const selectedClub = clubs.find(c => c.id === clubId);
+    if (selectedClub) {
+      document.cookie = `X-Tenant-Id=${selectedClub.tenantId}; path=/; max-age=86400`;
+    }
     queryClient.invalidateQueries();
   };
 
   const userRole = activeClubId && session?.user?.clubs ? session.user.clubs[activeClubId] || null : null;
 
   return (
-    <TenantContext.Provider value={{ activeClubId, setActiveClub: handleSetActiveClub, userRole, clubs }}>
+    <TenantContext.Provider value={{ activeClubId, setActiveClub: handleSetActiveClub, userRole, clubs, clubsLoading, clubsError: clubsError || null }}>
       {children}
     </TenantContext.Provider>
   );

frontend/src/lib/api.ts

@@ -1,22 +1,31 @@
 import { getSession } from 'next-auth/react';
 
-const ACTIVE_CLUB_KEY = 'activeClubId';
+function getTenantIdFromCookie(): string | null {
+  if (typeof document === 'undefined') {
+    return null;
+  }
+
+  try {
+    const cookies = document.cookie.split(';');
+    for (const cookie of cookies) {
+      const [name, value] = cookie.trim().split('=');
+      if (name === 'X-Tenant-Id') {
+        return decodeURIComponent(value);
+      }
+    }
+  } catch {
+    // Cookie parsing may fail in some environments
+  }
+
+  return null;
+}
 
 export async function apiClient(
   url: string,
   options: RequestInit = {}
 ): Promise<Response> {
   const session = await getSession();
-  let activeClubId: string | null = null;
-  
-  try {
-    activeClubId = typeof localStorage !== 'undefined' 
-      ? localStorage.getItem(ACTIVE_CLUB_KEY) 
-      : null;
-  } catch {
-    // localStorage may not be available in some environments
-    activeClubId = null;
-  }
+  const tenantId = getTenantIdFromCookie();
 
   const headers: Record<string, string> = {
     'Content-Type': 'application/json',
@@ -27,8 +36,8 @@ export async function apiClient(
     headers['Authorization'] = `Bearer ${session.accessToken}`;
   }
 
-  if (activeClubId) {
-    headers['X-Tenant-Id'] = activeClubId;
+  if (tenantId) {
+    headers['X-Tenant-Id'] = tenantId;
   }
 
   return fetch(url, {